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Fire retardancy of polypropylene composites using intumescent coatings
Polyolefins, and in particular PP (polypropylene), are increasingly used in building, transport and electrical applications due to their low cost, good properties and easy process. However, their flammability is poor. They burn with a hot and clean flame, accompanied by melting and subsequent dripping or flowing of the molten polymer, limiting the widening of their application domains. To flame retard polymer in general and polyolefins in particular, fire retardant additives can be added to the matrix using an extrusion process. However, in a number of applications, the required level of fire retardant properties is more and more difficult to reach, e.g. in electrical applications, where UL94 classification is required for a sample thickness of 1.6 mm or even 0.8 mm now, compared to 3.2 mm a few years ago. Two approaches can be followed to achieve acceptable performance and meet the higher requirements, (i) the development of higher effective FR (fire retardant) systems and/or the development of synergistic systems and (ii) the use of fire retardant coatings. The second approach has been followed in this study. PP composites presenting UL94 V0 rating classification and classified at 960 deg C in Glow Wire test were obtained using intumescent coating and specific surface treatment such as cold plasma treatment prior to make the deposit. Treated and untreated samples were examined by XPS (X-ray photoelectron spectroscopy), AFM (atomic force microscopy), and contact angle measurements. The plasma treatment significantly alters the surface wetting behaviour of the isotactic PP composites. Cold plasma treatment significantly improves the wettability of the materials introducing the polar groups on surfaces, reducing the contact angles and increasing the surface roughness. It results in an improvement of the adhesion of the intumescent paint on the composites. This good adhesion enables to achieve V0 rating for both composite materials, PPt (PP with talc) and PPc (PP with calcium carbonate), and a classification at the GWI test at 960 deg C for PPc material.
Fire retardancy of polypropylene composites using intumescent coatings
Polyolefins, and in particular PP (polypropylene), are increasingly used in building, transport and electrical applications due to their low cost, good properties and easy process. However, their flammability is poor. They burn with a hot and clean flame, accompanied by melting and subsequent dripping or flowing of the molten polymer, limiting the widening of their application domains. To flame retard polymer in general and polyolefins in particular, fire retardant additives can be added to the matrix using an extrusion process. However, in a number of applications, the required level of fire retardant properties is more and more difficult to reach, e.g. in electrical applications, where UL94 classification is required for a sample thickness of 1.6 mm or even 0.8 mm now, compared to 3.2 mm a few years ago. Two approaches can be followed to achieve acceptable performance and meet the higher requirements, (i) the development of higher effective FR (fire retardant) systems and/or the development of synergistic systems and (ii) the use of fire retardant coatings. The second approach has been followed in this study. PP composites presenting UL94 V0 rating classification and classified at 960 deg C in Glow Wire test were obtained using intumescent coating and specific surface treatment such as cold plasma treatment prior to make the deposit. Treated and untreated samples were examined by XPS (X-ray photoelectron spectroscopy), AFM (atomic force microscopy), and contact angle measurements. The plasma treatment significantly alters the surface wetting behaviour of the isotactic PP composites. Cold plasma treatment significantly improves the wettability of the materials introducing the polar groups on surfaces, reducing the contact angles and increasing the surface roughness. It results in an improvement of the adhesion of the intumescent paint on the composites. This good adhesion enables to achieve V0 rating for both composite materials, PPt (PP with talc) and PPc (PP with calcium carbonate), and a classification at the GWI test at 960 deg C for PPc material.
Fire retardancy of polypropylene composites using intumescent coatings
Duquesne, Sophie (author) / Renaut, Nicolas (author) / Bardollet, Pierre (author) / Jama, Charaf (author) / Traisnel, Michel (author) / Delobel, Rene (author)
2008
3 Seiten, 4 Bilder, 3 Tabellen, 4 Quellen
Conference paper
English
flammhemmende Behandlung , Polymermatrix-Verbundwerkstoff , Polypropylen , Talk , Calciumcarbonat , Schutzschicht , Brandschutz , Brandschutzmittel , Materialklassifizierung , Entflammbarkeitsprüfung , Plasmabearbeiten , Benetzbarkeit , technologische Materialeigenschaft , Beschichten von Kunststoff
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